Microsoft Office 2013 as a "portable" application typically refers to using it without a standard installation on a guest computer, often from a USB drive. While Microsoft does not offer an official portable version, you can achieve similar functionality through legitimate virtualization or online tools. Microsoft Learn Official Alternatives for Portability

Summary

Unofficial "portable" Office 2013 builds exist but pose legal, functional, and security risks. Prefer official web/ subscription options or legitimate portable alternatives like LibreOffice Portable for safe, portable productivity.

Sync with OneDrive: Even though you're using a portable version, saving your files to a synced folder ensures that your work is backed up the moment you hit a Wi-Fi hotspot.

Review: Microsoft Office 2013 "Portable" Editions